Brilliant, thanks for the quick replies.
R5gt - thanks for that, I didn't even know that was an option so I will get straight on to them. You might have just saved me £40!
Peskyjones - I'm running a revo stage 1 map, but I was of the same mind that a small drop in surface area would make no noticeable difference. But I'm making that assumption based on no experience or expertise whatsoever!!